The return value of the MUL function is a string type.Apply the VALUE function and convert it to 8 byte floating point.

We specify 0 for the number of digits in the ROUND function and round off the number as the nearest integer.

Since the final calculation result is of integer type, we are explicitly converting the type by (int) being added at the beginning.

The item "Hidden item consumption tax (HIDDENTAX)" is blank (null) when a date that does not exist in the consumption tax master (the date before the first consumption tax is set) is taken as the order entry date, but $ {HIDDENTAX } Will return 0.0.This is an expression after Wagby has expanded, as it will return 0.0 if the selected result is null (which is the initial value of the 8 byte floating point type).Using this property, in this case the consumption tax is set to 0.